JP2002134078A - Collective battery pack - Google Patents

Abstract

(57) [Summary] [Problem] To improve maintainability and assemblability. SOLUTION: An assembled battery 21 including a plurality of unit cells 22.
Is held by a lid holder 41 holding the surface of the unit cells 22 on which the electrodes 24 are arranged and a box-shaped storage holder member 31 holding the surface opposite to this surface. Holder 4 that abuts and fixes each cell 22
2 and a plurality of busbar engaging portions 4 for engaging the busbar 60 connecting the electrodes 24 of the adjacent unit cells 22 with play.
4 and an exhaust passage 50 for exhausting gas from the safety valve 28 of the cell 22. By simply attaching the lid holder 41 to the storage holder member 31, the connection of the bus bar 60 and the formation of the exhaust passage 50 are performed.
Can be improved. Further, even if the lid holder 41 is removed, the individual cells 22 do not fall apart, so that the maintainability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled battery pack, and more particularly to an assembled battery pack having an assembled battery formed by connecting a plurality of cells.

[0002]

2. Description of the Related Art Conventionally, as an assembled battery pack of this type, end plates are arranged at both ends of an assembled battery in which a plurality of cells are stacked, and the cells constituting the assembled battery are fixed by restraint bands. Some have been proposed (for example, Japanese Patent Application Laid-Open No. 9-120809). In this assembled battery pack, the electrodes of the unit cells constituting the assembled battery are arranged on a surface different from the surface on which the restraining band for restraining the assembled battery is arranged, and the electrodes of the adjacent unit cells are connected using a plurality of connecting plates. They are connected in series. An insulating cover is arranged on the surface on which the electrodes are arranged to ensure insulation. Further, a ventilation hole is provided in the insulating cover so that a plurality of cells constituting the assembled battery can be cooled.

[0003]

However, in such an assembled battery pack, when replacing some of the cells,
Most of the parts need to be removed, and there is a problem that workability during maintenance is extremely poor. In addition, when the cells are connected in series, the individual electrodes are connected by a plurality of connecting plates, so that the assemblability of the assembled battery is not good. Furthermore, the exhaust from the safety valve, which is installed to prevent the occurrence of a high voltage inside the cell due to the occurrence of some abnormality in the unit cell, is performed together with the ventilation for cooling. Corrosion may also occur.

[0004] It is an object of the present invention to improve the workability during maintenance. Another object of the battery pack of the present invention is to improve assemblability. Another object of the battery pack of the present invention is to prevent unnecessary stress from acting on the electrodes of the unit cells. Another object of the battery pack of the present invention is to suppress inconvenience due to exhaust from a safety valve.

[0005]

Means for Solving the Problems and Their Functions and Effects The battery pack of the present invention employs the following means to achieve at least a part of the above object.

[0006] An assembled battery pack of the present invention is an assembled battery pack having an assembled battery formed by connecting a plurality of cells, wherein one surface of the assembled battery on which electrodes of the plurality of cells are arranged; The gist of the present invention is to provide a holder for holding the assembled battery by the one surface of the assembled battery and the other surface facing the other surface.

In the assembled battery pack of the present invention, the holder is used to hold the assembled battery by one surface on which the electrodes of the plurality of unit cells are arranged and the other surface of the assembled battery facing the one surface. Hold. This allows
Maintenance of each cell constituting the assembled battery can be easily performed simply by removing the holder.

In the battery pack of the present invention, the holder includes a first holding member that holds the battery pack from the one surface side and a second holding member that holds the battery pack from the other surface side. May be provided. In the battery pack of the present invention in this aspect,
The second holding member may be formed with a unit cell storage portion capable of storing each of the plurality of unit cells. In this case, even when the first holding member is removed, the individual cells do not fall apart.

Further, in the battery pack of the present invention,
The holder may be configured such that a bus bar that connects electrodes of the plurality of unit cells is displaceably engaged with the one surface side. In this case, the electrodes of each unit cell can be connected only by holding the assembled battery by the holder. In addition, since the bus bar is displaceably engaged, it is possible to prevent the bus bar from being subjected to excessive stress. In the battery pack of the present invention in this aspect,
The holder attaches the holding portion holding the unit cell and the bus bar so that the bus bar does not apply stress to the electrodes of the plurality of unit cells when the assembled battery is held by the holding unit. An engaging portion may be provided. With this configuration, the holding portion receives the stress necessary for holding the unit cell and does not apply any stress to the bus bar, so that unnecessary stress is not applied to the electrode of the unit cell.

Further, in the assembled battery pack of the present invention, the holder may have an exhaust portion for exhausting gas from the safety valves of the plurality of unit cells on the one surface side. In this way, the inconvenience due to the exhaust from the safety valve can be suppressed. In the assembled battery pack according to the aspect of the present invention, when the exhaust unit is disposed in a tubular exhaust flow path having an opening in a longitudinal direction, and the plurality of cells are arranged such that the safety valve is aligned with the opening. And a sealing member for sealing the exhaust passage.

[0011]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is an exploded perspective view schematically showing the configuration of an assembled battery pack 20 according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the assembled battery pack 20 of the embodiment illustrated in FIG.
It is sectional drawing of the AA cross section at the time of assembling. As shown, the assembled battery pack 20 of the embodiment includes a lid holder 41 that holds an assembled battery 21 composed of a plurality of unit cells 22 from a surface on which the electrodes 24 of the unit cells 22 are disposed, and a surface facing the surface. It is configured to be held by a holder 30 including a holding holder member 31 to be held.

The unit cell 22 is configured as, for example, a lithium-ion battery or a nickel-metal hydride battery, and has positive and negative electrodes 24 and exhausts the internal gas when the internal pressure increases to prevent the internal pressure from becoming high. And a safety valve 28.

The storage holder member 31 is formed in a box shape having an opening by an insulating material (for example, resin), and has a plurality of partitions therein for forming storage portions 34 for storing the respective cells 22. 32 are formed. Therefore, by storing the cell 22 in each storage section 34,
Even when the lid holder 41 is removed from the storage holder member 31, it is possible to prevent the unit cells 22 from falling apart.

The lid holder 41 is also formed in a lid shape from the same material as the storage holder member 31. The lid holder 41 has a holding portion 42 that abuts on each unit cell 22 and fixes each unit cell 22, and a plurality of busbar engaging units 44 that engage a bus bar 60 that connects the electrodes 24 of the adjacent unit cells 22. When,
An exhaust passage 50 for exhausting gas from the safety valve 28 of the unit cell 22 is formed.

As shown in FIG. 2, the bus bar 60 is provided with a bus bar engaging portion 44 so that the lid holder 41 has a play.
Are fixed to each other by the engagement claws 46 and the disengagement prevention claws 48, and are attached to the bus bar attachment portions 25 of the electrodes 24 of the unit cells 22 by the bus bar retainers 62. Since the unit cells 22 are held by the holding unit 42, a stress necessary to hold the unit cells 22 does not act on the bus bar 60. As described above, since the bus bar 60 is attached to the lid holder 41 in advance, the assemblability of the assembled battery pack 20 can be improved.
In addition, since the stress required to hold the cell 22 is received by the holding portion 42 and the stress is not applied to the bus bar 60, unnecessary stress is not applied to the electrode 24 of the cell 22. .

The exhaust passage 50 is formed by adhering a seal member 54 made of an elastic material such as silicon rubber to a tube portion 52 having a tube shape having a cross section of about a half circle. In the seal member 54, an opening 56 is formed at a position matching the safety valve 28, and the other portions are
As shown in FIG. The sealing member 54 has the opening 56 aligned with the safety valve 28 of the cell 22 by attaching the lid holder 41 in a state where each cell 22 is stored in the storage portion 34 of the storage holder member 31, and the opening 56 The end contacts the unit cell 22 to form the exhaust passage 50 and seal the exhaust passage 50. As a result, the gas from the safety valve 28 of the unit cell 22 is exhausted through the exhaust passage 50 and does not touch the cooling device or the like. Thus, by attaching the exhaust passage 50 to the lid holder 41, the assemblability of the assembled battery pack 20 can be improved and inconvenience caused by the gas from the safety valve 28 can be avoided.

The battery pack 20 of the embodiment described above
According to this, even when the lid holder 41 is removed from the storage holder member 31, the individual cells 22 do not fall apart, so that the maintainability of the assembled battery pack 20 can be improved. Further, the busbar engaging portion 4 is attached to the lid holder 41.
Since the bus bar 60 is engaged by providing the battery pack 4, the assemblability of the assembled battery pack 20 can be improved. In addition, the stress required to hold the cell 22 is
2, and no stress is applied to the bus bar 60, so that unnecessary stress is not applied to the electrode 24 of the cell 22 and the damage to the cell 22 can be suppressed. Further, since the exhaust passage 50 for exhausting the gas from the safety valve 28 of the unit cell 22 is provided in the lid holder 41 with a sealing property, the assemblability of the assembled battery pack 20 can be improved and the gas from the safety valve 28 can be used. The resulting inconvenience can be avoided.

In the assembled battery pack 20 of the embodiment, a plurality of partitions 32 are provided inside the storage holder member 31 to form the storage portions 34 for storing the individual cells 22. However, the partitions 32 may not be formed. Absent. Further, in the assembled battery pack 20 of the embodiment, the storage holder member 31 is formed in a box shape, but may be formed in a plate shape having only a bottom portion facing the lid holder 41.

In the assembled battery pack 20 of the embodiment, the exhaust passage 50 is formed by bonding the seal member 54 to the tube portion 52. However, the seal member 54 is formed in the tube portion 52 by two-color molding. As shown in FIG. 3, the sealing member 54B is
It may be mounted by fitting into 2B.

In the assembled battery pack 20 of the embodiment, the end of the exhaust passage 50 is left open. However, a connecting portion such as a male and female connector connected to the adjacent assembled battery pack 20 may be formed. Good. In this case, the exhaust passages 50 of the plurality of assembled battery packs 20 can be easily connected.

In the assembled battery pack 20 of the embodiment, the bus bar engaging portion 44 is formed on the lid holder 41, but the bus bar engaging portion 44 may not be formed. Further, in the assembled battery pack 20 of the embodiment, the lid holder 41 has the exhaust passage 5
However, the exhaust channel 50 may not be formed.

The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the gist of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 shows an assembled battery pack 20 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view schematically showing the configuration of FIG.

FIG. 2 is an assembled battery pack 20 of the embodiment illustrated in FIG.
It is sectional drawing of the AA cross section at the time of assembling.

FIG. 3 shows a modified example of a tube portion 52B and a sealing member 54;
It is explanatory drawing which illustrates the mounting structure with B.

[Explanation of symbols]

Reference Signs List 20 battery pack, 21 battery pack, 22 unit cells, 24 electrodes, 28 safety valve, 30 holder, 31 storage holder member, 32 partition, 34 storage section, 41 lid holder, 42 holding section, 44 busbar engaging section, 46 section Claws, 48 Prevention claw, 50 Exhaust channel, 52, 52
B Tube part, 54, 54B Sealing member, 60 busbar, 62 busbar holder.

Claims (7)

[Claims] 1. An assembled battery pack having an assembled battery formed by connecting a plurality of unit cells, wherein one surface of the assembled battery in which the electrodes of the plurality of unit cells are arranged, and the one side of the assembled battery A battery pack comprising: a holder for holding the battery pack by the surface facing the other surface and the other surface facing the other surface. 2. The holder according to claim 1, wherein the holder includes a first holding member that holds the battery pack from the one surface side, and a second holding member that holds the battery pack from the other surface side. Battery pack. 3. The battery pack according to claim 2, wherein the second holding member is formed with a unit cell accommodating portion capable of accommodating each of the plurality of unit cells. 4. The assembled battery pack according to claim 1, wherein the holder is displaceably engaged with a bus bar connecting electrodes of the plurality of cells on the one surface side. 5. The holder according to claim 1, further comprising: a holding portion configured to hold the unit cells, wherein the bus bar does not act on the electrodes of the plurality of unit cells when the assembled battery is held by the holding unit. The battery pack according to claim 4, further comprising an engaging portion for engaging the bus bar. 6. The assembled battery pack according to claim 1, wherein the holder has an exhaust portion formed on the one surface side for exhausting gas from the safety valves of the plurality of unit cells. 7. The exhaust unit includes a tubular exhaust passage having an opening in a longitudinal direction, and the exhaust passage when the plurality of cells are arranged so that the safety valve is aligned with the opening. The battery pack according to claim 6, further comprising a sealing member for sealing.